The size of the outer frame of the 39 stepper motor flange is about 39*39mm (different manufacturers have different sizes, there are 38.8 or 39.3 and other sizes), the standard shaft diameter is 5mm, and the shaft length can be customized according to customer needs, but the most common shaft length is 20/24mm.
The length of the 39 stepper motor is generally 20~38mm, and a few achieve 44 or 47mm body length, and the holding torque is about 72~450mNm.
Both unipolar and bipolar drive models are available, as well as lead and plug outlet cables.
It should be noted that the hole spacing size of the 39 stepper motor and the 42 stepper motor is 31mm, so the 39 motor torque is not enough, and the space size is not particularly tight, it can be easily replaced with a 42 stepper motor.
The thinnest 42 stepper motor is generally more than 22mm long, while the 39 stepper motor can do 20mm body length, for the fuselage thickness requirements are very demanding, nema 16 stepper motor has advantages.